Error unmounting target is busy udisks-error-quark 14

I can't create partition image. Please help me to solve the problem.

Are you trying to create a partition on the device you are using?

If you wish to partition the drive you are using, you must boot from a bootable media like the Live Zorin installer. You can only unmount (umount command) a device that is not in use.

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Ah, I did not think about of that possibility.
As I get accustomed to Linux, I tend to overlook 101 questions :nerd_face: I have to be careful.